BIOL 150B Chapter Notes - Chapter 43.5: Boron, Nitrogen Cycle, Osmosis
11 Mar 2016
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Root pressure: positive pressure pushes water upwards from the roots. Only for short distances: suction pump: negative pressure pulls water up from the roots to leaves, capillary action: cohesion & adhesion inside xylem helps to ght gravity. Allows co to enter & h o to leave (a transpiration/photosynthesis compromise) Lots of water in cells = high turgor pressure = stomata open. Little water in cells = low turgor pressure = stomata close. Active uptake of k increases the solute [ ] water enters the guard cell stomata open (& vice versa) Carbon, oxygen, hydrogen, nitrogen, potassium, calcium, magnesium, sulphur, phosphorus. Make up 99. 5% of the plant dry weight: micronutrients: components or cofactors of enzymes that are needed in much smaller quantities. Transmembrane route: water goes out one cell, across the cell wall. & into the neighbouring cell: results in repeatedly crossing plasma membranes. Continuum of cytosol: passes through plant tissue through the plasmodesmata of cells: requires crossing only one membrane.
